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York YGAS Slide Valve O Rings

Hey, am after some info and trying to find out if other people have experienced similar. 2x YGAS Aircooled chillers. Both installed around same time, mid to late last year. Both have just failed with low evap pressure. Problem diagnosed as O ring failure on slide valve piston on both units. Seal has a life span of 3 to 5 years as advised by vendor. Anybody else experienced similar failures or problems after such a short timeframe?? Thks.